I would recommend making a Marketplace listing toward the high end of your price range, as you can always be open to offers.

As a sort of variation on this, I like to treat marketplace listings as something like reverse auctions: list at the high end of your expected range, and rather than soliciting offers, drop the price $20 or so every few days with bump-posts until someone decides it is a good deal for them. The marketplace still decides the value, but since the low-ballers are always out there, you can still decide to accept an offer somewhere along the way. It's mostly a question of how much of a hurry you are in to sell.

The above comments are good advice. It should be noted that the listed price is often higher than the negotiated sale price. It is highly unusual for sellers to update the listing if they were talked down.